Geodesic
Absence of limit cycles around a triple focus in a quadratic system in a plane
Differencialʹnye uravneniâ, Tome 22 (1986) no. 11, pp. 2015-2017.

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@article{DE_1986_22_11_a27,
     author = {L. A. Cherkas},
     title = {Absence of limit cycles around a triple focus in a quadratic system in a plane},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2015--2017},
     publisher = {mathdoc},
     volume = {22},
     number = {11},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_11_a27/}
}
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L. A. Cherkas. Absence of limit cycles around a triple focus in a quadratic system in a plane. Differencialʹnye uravneniâ, Tome 22 (1986) no. 11, pp. 2015-2017. http://geodesic.mathdoc.fr/item/DE_1986_22_11_a27/